I've been paddling for 8 years and rarely worn sun-glasses, mainly because I could not find a pair that worked well.
That changed with Wrap G Sunglasses from Canterbury Kayaking. I love them. They're effective, comfortable under my helmet, and stay on. Perfect.
Comfortable, polarized and perfect
They fit well with your helmet, light comfortable, good coverage and stay on.
What more do you want?
Great colours.